JPH0824972A - Method for working case - Google Patents

Abstract

PURPOSE:To improve the quality of a product by eliminating the reduction of a plate thickness at the working part in a method for forming a case used to a coin type electric double layer capacitor, etc. CONSTITUTION:An annular shaped and tapered groove part 2 is formed (E) on an aluminum side of a clad material made by laminating the aluminum and a stainless steel and thereafter, a punch-drawing work F for punching and drawing the bottom part of the groove part 2 is executed to obtain the case 3. By this method, the vertical burr of the aluminum is prevented, and the reduction of the plate thickness and dimensional fluctuation and the variation of the plate thickness of the side surface can be eliminated. Further, the die size is made small because the punch forming pitch interval can be reduced and the quality of a product and the yield of the material can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a case for forming a case of a coin type electric double layer capacitor made of a clad material laminated with aluminum and stainless steel, or a case used for a lower case of a coin type battery, etc. It is about the method.

[0002]

2. Description of the Related Art Conventionally, a method of processing a case of this type will be described with reference to the drawings.

4 (a) and 4 (b) are a plan view and a front view of a main part for explaining a method of processing a case by a conventional progressive feed press method, and from the left to the right of FIG. The processing process is in progress.

In the figure, A shows a state in which a blank punching process has been performed on the hoop-shaped clath material 1 in which aluminum and stainless steel which have been supplied in the first step are subjected to blank punching process, and B shows after performing the blank punching process A. The drawing shows a state where the drawing is performed, and C shows the case where the drawing 1 is performed after the drawing B is performed, and the case 1A is produced by such processing. . However, the drawing process B may require several steps depending on the desired shape.

FIG. 5 is a detailed view of the case 1A shown in FIG. 4 described above. The case 1A has a shape in which an outer shape cutaway surface 51 and a radius 52 at the time of progressive feeding are left in the inlet portion of the case 1A. The side surface of 1A was thin like the plate thickness varying portion 53.

[0006]

However, when the case 1A obtained by the above-described conventional case processing method is used for a coin type electric double layer capacitor, a coin type battery or the like, the upper lid and The structure is such that it is sealed by three parts that also use packing, and the case 1A used in such a configuration has the following problems.

First, the sealing performance becomes unstable due to the reduction in plate thickness and dimensional change near the case inlet, which is the most important factor when caulking the sealing. On the other hand, there is a problem in that the plate thickness varies on the side surface of the case due to the progressive drawing press working method, which also becomes an unstable element of the sealing property.

It is an object of the present invention to provide a method for processing a case which can solve all the above-mentioned conventional problems, improve the material usage efficiency, and significantly reduce the cost. is there.

[0009]

In order to solve the above-mentioned problems, a method for processing a case according to the present invention is provided with a taper having a wide upper end on at least one side of a clad material in which aluminum and stainless are laminated. In this processing method, an annular groove is formed, and then the bottom surface of the annular groove is punched out and the punched disk-shaped material is narrowed down to obtain a case having a concave cross section.

[0010]

With this method, it is possible to eliminate a reduction in plate thickness and dimensional change near the case inlet and a reduction in plate thickness on the side surface of the case, and it is possible to improve the reliability by eliminating the unstable element of the sealing property. .

[0011]

An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 (a) and 1 (b) are a plan view and a front sectional view of a main part for explaining a method of processing a case according to the embodiment, and a processing step from the left to the right in FIG. Is in progress.

In the figure, E shows a state in which the hoop-shaped clath material 1 in which aluminum and stainless are laminated is subjected to molding, and the details of the groove 2 subjected to the molding are shown in FIG.

In FIG. 2, the clat material 1 is a clat material in which aluminum 21 and stainless steel 22 are laminated,
Molding is performed on the aluminum 21 side so as to form a groove having a taper shape such that the upper end portion is wide. In addition, reference numeral 23 denotes a blank punching line which is a cutting position when performing the drawing process F in the next step.

In FIG. 1, F shows a state in which the case 3 is obtained by performing the drawing process F after the above-mentioned forming process E, and the details of the case 3 thus obtained are shown. 3 shows.

Since the blank punching line 23 in the portion where the molding process E is performed in FIG.
As described above, the tapered molding portion 31 can be left at the inlet of the drawing, and the vertical burr on the aluminum 21 side due to the elongation of the material due to the drawing can be prevented.

As described above, in the method of processing a case according to the present invention, the cutting and drawing process F does not cause a wasteful portion between the processed parts.

Therefore, the space between the materials forming the case 3 can be shortened, and the material use efficiency can be greatly improved.

Further, because of the drawing process F, it is possible to eliminate a reduction in plate thickness and a change in dimension near the entrance of the case 3, and a change in plate thickness on the side surface of the case 3.

In the above embodiment, the processed portion has a single-row configuration in the width direction of the hoop-shaped clath material 1, but it goes without saying that the same applies to a configuration having two or more rows. .

[0021]

As described above, the case processing method according to the present invention can prevent the reduction of the plate thickness and the dimensional change near the case inlet and the variation of the plate thickness on the side surface of the case, which are most important at the time of caulking the sealing. It is possible to improve the reliability by eliminating the unstable element.

Further, since the vertical burrs of aluminum can be eliminated at the time of cutting and drawing the clad material in which aluminum and stainless are laminated, and a space between the processed parts of the material is not required, the pitch interval is shortened. Therefore, the size of the mold can be reduced, and the material yield can be increased, so that there is a great practical effect in terms of economy.

[Brief description of drawings]

FIG. 1A is a plan view of a main part of a processing material for explaining a method of processing a case according to an embodiment of the present invention. FIG.

FIG. 2 is a cross-sectional view of the main part of the part where the molding process is performed.

FIG. 3 is a cross-sectional view of a main part of a case obtained by performing a drawing process.

FIG. 4A is a plan view of a main part of a processing material for explaining a processing method in a conventional progressive press, and FIG.

FIG. 5 is a sectional view of a main part of a case obtained by a conventional progressive press.

[Explanation of symbols]

 1 Clut material 2 Groove part 3 Case 21 Aluminum 22 Stainless steel 23 Blank punching line 31 Forming part

Claims (1)

[Claims] 1. An annular groove having a taper having a wide upper end on at least one side is formed on the aluminum side of a clad material obtained by laminating aluminum and stainless steel, and then the bottom surface of the annular groove is punched out. A case processing method in which the punched disk-shaped material is narrowed down to obtain a case having a concave cross-section.